Fiddle with Focus to Add Some Bokeh to Long Exposure Night Shots

PetaPixel

Claus Thiim captured this beautiful image of fireworks showing both in-focus and out-of-focus burst of light. The trick is to capture most of the photograph while focused on the fireworks, and then throw the lens out of focus shortly before the shutter closes.

On a slightly related note, check out this crazy video of an entire fireworks display released in just one minute (something went wrong).